30
2. DETAIL EXPLANATION OF CIRCUIT ACTION (ACTION OF CW WASH)
•In case MICOM TERMINAL No. 10 is 'L', the Q8 (A1270Y) turn on and control the TRIAC. The resistance, as 62
Ω
& 1/2W,
of the R21 is used to limit the GATE current of the TRIAC.
•The ceramic condenser C2 between the T1 and the GATE of the TRIAC is used for preventing the wrong action by means
of the noise.
•The R1 (100
Ω
, 1W) and C1 (683K) between the T1 and T2 of the TRIAC is used for protecting the TRIAC, it is usually called
SNUBBER CIRCUIT.
•The waveform of MICOM pin No. 1
3. CAUTION AND CHECKING FOR A/S
• If load is active as soon as the power switch is ‘ON’, check the driving TRIAC of load.
• Check the MICOM output terminal, if the load doesn't act although the TRIAC isn't anything wrong.
• Sometimes it is happened that the TRIAC DRIVE TR has a short circuit or an open circuit. In this case, being measured
the resistance between the TR E & C with tester, the resistance value should be near the
∞Ω
. If not, the DRIVE TR is out
of order.
• If the ceramic condenser (C2, C4, C6, C8, C10, C12, C14) using by protecting the noise between the GATE & T1 of each
TRIAC has a short circuit, it has no voltage drop between the T1 and GATE. Therefore, the TRIAC is not turn on.
SM12JZ47 (12A), SM8JZ47 (8A) SM3J247 (3A)
BCR1AM-12L
• CHECK the resistance of the T1 & T2
• CHECK the resistance of the T1 & T2
of the TRIAC. (
∞Ω
).
of the TRIAC. (
∞Ω
).
• CHECK the total parts without fail, in
• CHECK the total parts without fail, in
case the TRIAC has a short circuit.
case the TRIAC has a short circuit.
R1 100 1W
AC 6V
C2
104Z
TRC1 SM12JZ47
C1 683K
6V
R67 3.9K
MICOM
10
Q8 A1270Y
10K
R21 62 1/2W
STOP
STOP
ACTION
0V
6V
Terminal No. 10
t
ACTION
0V
6V
Terminal No. 3
t
shape
T1 T2 G
T1 G T2
shape
